Unlike
most other cephalopods, the majority of octopuses - those in the suborder most commonly known, Incirrata - have almost entirely soft bodies with no internal skeleton.
This is true not just for humans and other vertebrates but for squids and
other cephalopods as well.
Related sites CephBase — images and taxonomic data on octopuses and
other cephalopods Lecture on octopus diversity by Mark Norman
Octopus reflectins are relatively dissimilar to reflectins
in other cephalopods, suggesting that a single gene was present in a cephalopod ancestor, which then duplicated and evolved independently in different species.
Efforts to sequence the genomes
of other cephalopods are currently underway through the Cephalopod Sequencing Consortium.
They have a simple form of memory, despite having much simpler brains than
other cephalopods.
Other cephalopods, like octopuses and nautiluses, lack S - crystallin lens proteins.
As if octopuses, squids and
other cephalopods were not already strange enough, they may have found a way to evolve that is foreign to practically all other multicellular organisms on the planet.
Other cephalopods, like cuttlefish, are known to assume a darker color during disputes, with males displaying a «dark face.»
The blue - ringed octopus's brawny approach is unique —
all other cephalopods use sacs of pigment, called chromatophores, to change their colors.
Such RNA editing happens frequently in octopuses and
other cephalopods and sometimes in humans (SN: 4/29/17, p. 6).
Motani argues that giant eyes were an adaptation for diving down 500 metres or more to hunt for squid and
other cephalopods, such as the now extinct belemnites.